Hebrews 9:16-22

Where a will exists, the death of the one who made it must be established. For a will is valid only when people die, since it is never in force while the one who made it is living. That is why even the first covenant was inaugurated with blood. For when every command had been proclaimed by Moses to all the people according to the law, he took the blood of calves and goats, along with water, scarlet wool, and hyssop, and sprinkled the scroll itself and all the people, saying, This is the blood of the covenant that God has commanded for you. In the same way, he sprinkled the tabernacle and all the articles of worship with blood. According to the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness.